MIMO equalization optimized for baud rate clock recovery in coherent 112Gbit/sec DP-QPSK metro systems

Gorshtein, Alik; Sadot, Dan; Dorman, G.

doi:10.1016/j.yofte.2014.12.002

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…The concept of baud-rate sampling coherent receiver has been demonstrated in several offline-DSP based experiments by introducing an additional low-pass anti-aliasing filter either at the Transmitter side [14] or at the Receiver side [18] to help 1) reduce the impact of sampling phase sensitivity and 2) to increase the CD/PMD tolerance. A 2 × 2 MIMO equalization architecture optimized for baud-rate clock recovery is also reported in [16].…”

Section: Low-power Baud-rate Coherent Dspmentioning

confidence: 99%

Beyond 1 Tb/s Intra-Data Center Interconnect Technology: IM-DD OR Coherent?

Zhou

Urata

Liu

2020

J. Lightwave Technol.

200

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We discuss technology options and challenges for scaling intra-datacenter interconnects beyond 1 Tb/s bandwidths, with focus on two possible approaches: pulse amplitude modulation (PAM)-based intensity modulation-direct detection (IM-DD) and baud-rate sampled coherent technology. In our studies, we compare the performance of various orders of PAM modulation (PAM4 to 8). In addition to these fixed PAM signaling options, a flexible PAM (FlexPAM) technique leveraging granularity in spectral efficiency (SE) is proposed to maximize link margin. For baud-rate sampled coherent technology, we propose a simplified digital signal processing (DSP) architecture to bring down power consumption of the coherent approach closer to that of IM-DD PAM. We also propose two new phase noise tolerant 2D coherent modulation formats to relax the laser linewidth requirement. In closing, a comparative study of fixed IM-DD PAM versus coherent polarization multiplexed-quadrature amplitude modulation (PM-QAM) is presented for a 1.6 Tb/s solution (200 Gb/s per dimension), with consideration of link loss/reach budget, power consumption, implementation complexity, as well as fan-out granularity.

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Section: Low-power Baud-rate Coherent Dspmentioning

confidence: 99%

Beyond 1 Tb/s Intra-Data Center Interconnect Technology: IM-DD OR Coherent?

Zhou

Urata

Liu

2020

J. Lightwave Technol.

200

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Improved multiplier-free Mueller-Müller Baud-rate timing error detector for optical IM/DD system

et al. 2021

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Baud rate clock recovery scheme that supports high order modulation formats is an essential part in digital signal processing for current short reach transmission. In this paper, we propose an improved multiplier-free Mueller-Müller timing error detector (MMTED) sampling at baud rate, which shows excellent performance with low complexity. Using the sign operation, the multiplier is eliminated. The further use of error signal to substitute the original data helps to reduce the jitter of the clock. 25 GBaud PAM-4/8 and 50 GBaud PAM-4 transmission are carried out to evaluate the TED performance. Compared to the sign MMTED, more than 12 dB timing jitter improvement is realized.

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Performance enhancement and analysis of 40 GB/s dual channel hybrid FSO/FO link under diverse weather conditions

Parkash

Banga

2023

Journal of Optical Communications

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This paper is demonstrating the simulative comparisons and investigation of free-space optical fiber optic (FSO/FO) hybrid link under the effects of clear sky, haze and light rain weather conditions by using phase shift keying (PSK) modulation format with a data rate 40 GB/s at 1550 nm wavelength. An optical amplifier with 40 dB gain is placed before the FSO transmitter to boost the amplitude of a weak signal. A combination of multiple FSO transmitters, erbium-doped fiber (EDF) 3 m and bidirectional dispersion compensating fiber (DCF) 3.2 km are employed to overcome the effect of attenuation in the propagating channel. The performance of the system is evaluated in terms of BER, SNR, Q factor and eye diagrams. It has been observed that the performance of dual-channel hybrid FSO/FO is very robust as compared to conventional FSO/FO systems. While the communication distance with the hybrid link is escalated up to 54 km, 11 km and 5.5 km in a clear sky, haze and light rain climate conditions correspondingly. The satisfying values of BER have been observed as 10−14, 10−11, and 10−13 for clear, haze and light rain weather conditions, respectively.

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MIMO equalization optimized for baud rate clock recovery in coherent 112Gbit/sec DP-QPSK metro systems

Cited by 3 publications

References 13 publications

Beyond 1 Tb/s Intra-Data Center Interconnect Technology: IM-DD OR Coherent?

Beyond 1 Tb/s Intra-Data Center Interconnect Technology: IM-DD OR Coherent?

Improved multiplier-free Mueller-Müller Baud-rate timing error detector for optical IM/DD system

Performance enhancement and analysis of 40 GB/s dual channel hybrid FSO/FO link under diverse weather conditions

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